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  <time datetime="2019-08-25T08:41:38.000Z" itemprop="datePublished">2019-08-25</time>
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      JavaScript基础知识点--BOM基础及window对象
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<h1 id="什么是-BOM"><a href="#什么是-BOM" class="headerlink" title="什么是 BOM"></a>什么是 BOM</h1><p>BOM（browser object model）浏览器对象模型</p>
<h2 id="BOM-对象"><a href="#BOM-对象" class="headerlink" title="BOM 对象"></a>BOM 对象</h2><ul>
<li><p>window</p>
</li>
<li><p>navigator</p>
</li>
<li><p>screen</p>
</li>
<li><p>history</p>
</li>
<li><p>location</p>
</li>
<li><p>document</p>
</li>
<li><p>event</p>
</li>
</ul>
<h1 id="window"><a href="#window" class="headerlink" title="window"></a>window</h1><p>window 是浏览器的一个实例，在浏览器中，window 对象有双重角色，它既是通过 JavaScript访问浏览器窗口的一个接口，又是 ECMAScript 规定的 Global 对象</p>
<p>所有全局变量和全局方法都被归在 window 对象上</p>
<h2 id="window-对象方法"><a href="#window-对象方法" class="headerlink" title="window 对象方法"></a>window 对象方法</h2><h3 id="alert"><a href="#alert" class="headerlink" title="alert"></a>alert</h3><h4 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h4><blockquote>
<p>window.alert(“content”)</p>
</blockquote>
<h4 id="功能"><a href="#功能" class="headerlink" title="功能"></a>功能</h4><p>显示带有一段消息和一个确认按钮的警告框</p>
<h3 id="confirm"><a href="#confirm" class="headerlink" title="confirm"></a>confirm</h3><h4 id="语法-1"><a href="#语法-1" class="headerlink" title="语法"></a>语法</h4><blockquote>
<p>window.confirm(“message”)</p>
</blockquote>
<h5 id="功能-1"><a href="#功能-1" class="headerlink" title="功能"></a>功能</h5><p>显示一个带有指定消息和 OK 及取消按钮的对话框</p>
<h5 id="返回值"><a href="#返回值" class="headerlink" title="返回值"></a>返回值</h5><ul>
<li><p>如果用户点击确定按钮，则 confirm()返回 true</p>
</li>
<li><p>如果用户点击取消按钮，则 confirm()返回 false</p>
</li>
</ul>
<h3 id="prompt"><a href="#prompt" class="headerlink" title="prompt"></a>prompt</h3><h4 id="语法-2"><a href="#语法-2" class="headerlink" title="语法"></a>语法</h4><blockquote>
<p>window.prompt(“text, defaultText”)</p>
</blockquote>
<h4 id="参数说明"><a href="#参数说明" class="headerlink" title="参数说明"></a>参数说明</h4><ul>
<li><p>text：要在对话框中显示的纯文本（而不是 HTML 格式的文本）</p>
</li>
<li><p>defaultText：默认的输入文本</p>
</li>
</ul>
<h4 id="返回值-1"><a href="#返回值-1" class="headerlink" title="返回值"></a>返回值</h4><ul>
<li><p>如果用户单击提示框的取消按钮，则返回 null</p>
</li>
<li><p>如果用户单击确认按钮，则返回输入字段当前显示的文本</p>
</li>
</ul>
<h3 id="open"><a href="#open" class="headerlink" title="open"></a>open</h3><h4 id="语法-3"><a href="#语法-3" class="headerlink" title="语法"></a>语法</h4><blockquote>
<p>window.open(pageURL, name, parameters)</p>
</blockquote>
<h4 id="功能-2"><a href="#功能-2" class="headerlink" title="功能"></a>功能</h4><p>打开一个新的浏览器窗口或查找一个已命名的窗口</p>
<h4 id="参数说明-1"><a href="#参数说明-1" class="headerlink" title="参数说明"></a>参数说明</h4><ul>
<li><p>pageURL：子窗口路径</p>
</li>
<li><p>name：子窗口句柄（name 声明了新窗口的名称，方便后期通过 name 对子窗口进行引用）</p>
</li>
<li><p>parameters：窗口参数（各参数用逗号分隔）</p>
</li>
</ul>
<h5 id="参数parameters说明"><a href="#参数parameters说明" class="headerlink" title="参数parameters说明"></a>参数parameters说明</h5><table>
<thead>
<tr>
<th>可选参数</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>width</td>
<td>窗口宽度</td>
</tr>
<tr>
<td>height</td>
<td>窗口高度</td>
</tr>
<tr>
<td>left</td>
<td>窗口X轴坐标</td>
</tr>
<tr>
<td>top</td>
<td>窗口Y轴坐标</td>
</tr>
<tr>
<td>toolbar</td>
<td>是否显示浏览器的工具栏</td>
</tr>
<tr>
<td>menubar</td>
<td>是否显示菜单栏</td>
</tr>
<tr>
<td>scrollbars</td>
<td>是否显示滚动条</td>
</tr>
<tr>
<td>location</td>
<td>是否显示地址字段</td>
</tr>
<tr>
<td>status</td>
<td>是否添加状态栏</td>
</tr>
</tbody></table>
<h3 id="close"><a href="#close" class="headerlink" title="close"></a>close</h3><h4 id="语法-4"><a href="#语法-4" class="headerlink" title="语法"></a>语法</h4><blockquote>
<p>window.close()</p>
</blockquote>
<h4 id="功能-3"><a href="#功能-3" class="headerlink" title="功能"></a>功能</h4><p>关闭浏览器窗口</p>
<h1 id="超时调用"><a href="#超时调用" class="headerlink" title="超时调用"></a>超时调用</h1><h2 id="语法-5"><a href="#语法-5" class="headerlink" title="语法"></a>语法</h2><blockquote>
<p>setTimeout(code, millisec)</p>
</blockquote>
<h2 id="功能-4"><a href="#功能-4" class="headerlink" title="功能"></a>功能</h2><p>在指定的毫秒数后调用函数或计算表达式</p>
<h2 id="参数说明："><a href="#参数说明：" class="headerlink" title="参数说明："></a>参数说明：</h2><ul>
<li><p>code：要调用的函数或要执行的 JavaScript 代码串</p>
</li>
<li><p>millisec：在执行代码前需等待的毫秒数</p>
</li>
</ul>
<h2 id="返回值-2"><a href="#返回值-2" class="headerlink" title="返回值"></a>返回值</h2><p>该方法返回一个 ID 值，通过它取消超时调用</p>
<h1 id="清除超时调用"><a href="#清除超时调用" class="headerlink" title="清除超时调用"></a>清除超时调用</h1><h2 id="语法-6"><a href="#语法-6" class="headerlink" title="语法"></a>语法</h2><blockquote>
<p>clearTimeout(id_of_settimeout)</p>
</blockquote>
<h2 id="功能-5"><a href="#功能-5" class="headerlink" title="功能"></a>功能</h2><p>取消由 setTimeout() 方法设置的 timeout</p>
<h2 id="参数说明-2"><a href="#参数说明-2" class="headerlink" title="参数说明"></a>参数说明</h2><ul>
<li>id_of_settimeout：由 setTimeout() 返回的 ID 值，该值标识要取消的延迟执行代码块</li>
</ul>
<h1 id="间歇调用"><a href="#间歇调用" class="headerlink" title="间歇调用"></a>间歇调用</h1><h2 id="语法-7"><a href="#语法-7" class="headerlink" title="语法"></a>语法</h2><blockquote>
<p>setInterval(code, millisec)</p>
</blockquote>
<h2 id="功能-6"><a href="#功能-6" class="headerlink" title="功能"></a>功能</h2><p>每隔指定的时间执行一次代码</p>
<ul>
<li><p>code：要调用的函数或要执行的代码串</p>
</li>
<li><p>millsec：周期性执行或调用 code 之间的时间间隔，以毫秒计</p>
</li>
</ul>
<h1 id="清除间歇调用"><a href="#清除间歇调用" class="headerlink" title="清除间歇调用"></a>清除间歇调用</h1><h2 id="语法-8"><a href="#语法-8" class="headerlink" title="语法"></a>语法</h2><blockquote>
<p>clearInterval(id_of_setinterval)</p>
</blockquote>
<h2 id="功能-7"><a href="#功能-7" class="headerlink" title="功能"></a>功能</h2><p>取消 setInterval() 方法设置的 interval</p>
<h2 id="参数说明：-1"><a href="#参数说明：-1" class="headerlink" title="参数说明："></a>参数说明：</h2><ul>
<li>id_of_setinterval：由 setInterval() 返回的 ID 值</li>
</ul>

      
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